Notes, To-do lists, Task's
Notes, Task, to-do list, is essential in any calendar.
Mandatory in Proton Business.
This is the only way to make Proton Calendar a real alternative to Outlook.
They can and must improve.
Much appreciated.

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Cecil Donaldson commented
For the task stuff there is already a feature request:
https://protonmail.uservoice.com/forums/932842-proton-calendar/suggestions/7158378-proton-tasks-to-do-list -
Isaac G. commented
Google's "Tasks" is almost perfect. It's not bloated with features - and does just one thing that it's supposed to. There are only two faults I see with it. 1. That's it's Google and therefore offers practically no privacy. 2. When a task has sub-tasks, they do not get grouped in the "Completed" section - and get moved there as independent tasks. Something similarly simple and well thought out as part of Proton app suite would be ideal!
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user01 commented
An app for notes and tasks ist essential and very important for me. Integration with calendar is helpful